Arrangement in staying a telescopic tower by means of stay wires

ABSTRACT

A telescopic tower is stayed by wires extending in three or four vertical planes. In each plane the wires connected to the tower at different levels have their lower ends connected to a point situated somewhat above the ground which point is anchored to the ground. All of said connection points are situated in the same horizontal plane.

United States Patent Wessel I 51 June 27, 1972 [S4] ARRANGEMENT IN STAYING A TELESCOPIC TOWER BY MEANS OF STAY WIRES [72] inventor: Lars Anton Wessel, Uppsala, Sweden [73] Assignee: AB Wikstrlnd 8t Berg, Wibe, Mora,

Sweden [22] Filed: June 1-6, 1970 [21] Appl.No.: 46,662

[52] 0.8. (1 52/148, 52/149 [51 1 Int. E0411 12/20 [58] Fieldoisemh ..52/l48, 146,152, 111,121,

[S6] Relerences Cited UNITED STATES PATENTS 2,369,534 2/1945 Cohen ..52/ 148 X 1,664,922 4/1928 Goodrich ....52/148 1,793,381 2/1931 Vannatta et a1. ...52/148 3,119,471 1/1964 Turner ....52/ 148 3,368,319 2/1968 Werner et a1. ..52/ 148 X Primary Examiner-Price C. Faw, Jr. Anomey-Cushman, Darby & Cushman [57] ABSTRACT A telescopic tower is stayed by wires extending in three or four vertical planes. in each plane the wires connected to the tower at different levels have their lower ends connected to a point situated somewhat above the ground which point is anchored to the ground. All of said connection points are situated in the same horizontal plane.

2 Claims, 1 Drawing Figure ARRANGEMENT IN STAYING A TELECOPIC TOWER BY MEANS OF STAY WIRES The invention relates to an arrangement in the staying of a telescopically extensible tower or mast by means of stay wires fastened thereto at difierent levels and positioned in preferably three or four vertical planes through the tower.

An object of the invention is to facilitate the mounting of the tower,-particularly its erection in places where the ground is rugged or sloping so that the distances between the stay wire attachments ,upon the tower and the ground attachments differ considerably in the various vertical stay planes.

According to the invention said object is fulfilled thereby that in each vertical plane, wires connected to the tower at different levels have their lower end parts brought together and mutually connected at a point situated above the ground, all of said connection points being situated at the same distance from the tower and at the same level above its foot so that the stay wires extending from all of said connection points to any one of the tower attachment levels are of equal lengths. in addition to the simplification of the erection of the tower ensuing from the common anchoring to'the ground of all'stay wires located in the same vertical plane, the manufacture is also simplified due to the fact that the stay wires can be cut in fixed unitary lengths in the workshop so that no adjustment of stay wire lengths is required at the place of erection of the tower.

The invention will be more closely described herein below with reference to the accompanying drawing which diagrammatically shows a preferred embodiment of an arrangement for staying a tower according to the principles of the invention.

The tower shown in the drawing consists of three vertical sections 1 l, 13 and 15 which are telescopically extensible relatively to each other and which may consist of tubes or of lattice constructions having atriangular orsquare cross-section. The tower is stayed by means of a plurality of stay wires I attached to the tower at'certain preferred levels, viz. as a-rule at the level of the top end of each tower section. Furthermore, the stay wires are grouped in vertical planes through the tower, so that in each of said vertical planes a separate stay wire extends to each one of the attachment levels. The drawing shows stay wires 17, 19, 21 in afirst vertical plane, and stay wires 23, 25, 27 in a second stay plane lying at an angle of l80 relatively to the first-mentioned plane, whereas the stay wires in two further stay planes lying at an angle of 90 and 270 respectively, to the first-mentioned stay plane are not shown. However, in most cases it is sufficient to have stay wires in merely three vertical planes forming angles of approximately 120 to each other.

The lower ends of the stay wires 17, 19, 21 are interconnected at a point 29 situated a bit above the ground. The lengths of the stay wires are so chosen that all wires are tightly stretched when the telescopic tower sections 13, 15, 17 are fully extended. The same applies to the stay wires 23, 25, 27, the lower ends of which are brought together at the point 31. All stay wires attached to the tower at the same level are equally long; thus the wire 23 is equally long as the wire 17 (and as two stay wires not shown), the stay wires 25, 19 attached at the next staying level are equally long, d the wires 27, 31 attached to the top of the tower are also equally long. When the tower is stayed in its truly vertical position and the stay wires are stretched, the four wire connection points (29, 31 and two points not shown) are all positioned in one and the same horizontal plane 33 somewhat raised above the level of the tower foot 35, and at the same horizontal distance from the bottom tower section 1 1. The plane 33 may be regarded as an imaginary ground plane or a raised anchoring plane for the stay wires, which is independent of the actual ground conditions, and according to the invention the connection points 31, 29 placed in said plane are anchored to the ground as a secondary measure, this being performed separately and differently for each of them according to the posibilities therefor ofi'ered by the ground at the spot in question.

As shown in the drawing the stay connection point 29 is held fast to two ground anchorings consisting e. g. of poles 37, 39, by the intermediary of chain means such as chains or wires 41 and 43, respectively. These are positioned in the same vertical plane as the stay wires 17, 19, 21 and provided with stretching devices (not shown), while no stretching devices are inserted in the staying wires. The chains or wires 41, 43 form an acute angle situated opposite the angle comprised between the highest and the lowest stay wire 21 and. 17. The object thereof is that the resulting anchoring force acting in the point 29 should have such a direction that all stay wires are stretched tight with forces as uniform as possible.

Similarly the connection point is anchored to the ground by means of chains or wires 45, 47. in the field the lengths thereof are usually difierent'from the lengthsof the first-mentioned chains or wires 41, 43.

Of course, the invention can be applied to towers or masts consisting of more than three telescopic sections. At a certain level (or pomibly at several levels) the upper end parts of the stay wires may run first over sheaves attached .to the top end of one tower section and from there downwards to an attachment at the bottom end of the next higher tower section whereby said stay wires can serve for the elevation of said lastmentioned tower section. A further modification of the shown embodiment consists in that two stay wires extending to two consecutive levels form parts of one integral stay wire which runs over a sheave made fast to the connection point 29, as is shown and described in the copending US. Pat. application, Ser. No. 43,9l5, filed June 6, 1969. Of course, it is not necessary or even always possible to connect each wire with all the other wires inthe same vertical plane, but two or more wires may first be connected to each other to form a group and this group may then be connected to an other wire or an other group of wires.

I claim:

I. A tower structure which is supported by means of stay wires grouped in plural vertical planes radially disposed about the tower, stay wires in each of said planes extending between difierent levels of the tower and at least one common ground anchor for each vertical plane characterized in that those stay wires which are connected to the tower at each separate level have a fixed length, said wires being joined together at a common point near the ground level for each vertical plane and all of saidcommon points being disposed at an equal distance from the tower, and further comprising that plural chain means of adjustable length connect the common point of the pertaining vertical plane, to plural ground anchors situated at mutually difierent ground levels within each vertical plane and thus said chain means having different lengths from one another.

2. The tower structure as claimed in claim 1 characterized in that the point of mutual connection of the lower ends of stay wires in each vertical plane is connected to two ground anchors by means of two respective chain means which extend in the vertical plane of said stay wires and form between themselves an acute angle which is situated opposite to the angle comprised between the highest and the lowest of said stay wires.

UNITED STATES Q PATENT- OFFICE v CERTIFICATE OF CORRECTION I Patent No; 3 7 105 I V Dated June 27, 19 72 Inventor(s) Lars Anton WESSEL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Add to the heading:

--- Applicant claims priority Swedish application Serial No. 864n/69, filed'June 18, 1969.

Signed and sealed this 6th day of February 1973.

I (SEAL) Attest':

EDWARD M.FLETCHER,JR. ROERT GOT'ISCHALK v Attesting Officer Commissioner of Patents FORM PO-1050H0-69) 

1. A tower structure which is supported by means of stay wires grouped in plural vertical planes radially disposed about the tower, stay wires in each of said planes extending between different levels of the tower and at least one common ground anchor for each vertical plane characterized in that those stay wires which are connected to the tower at each separate level have a fixed length, said wires being joined together at a common point near the ground level for each vertical plane and all of said common points being disposed at an equal distance from the tower, and further comprising that plural chain means of adjustable length connect the common point of the pertaining vertical plane, to plural ground anchors situated at mutually different ground levels within each vertical plane and thus said chain means having difFerent lengths from one another.
 2. The tower structure as claimed in claim 1 characterized in that the point of mutual connection of the lower ends of stay wires in each vertical plane is connected to two ground anchors by means of two respective chain means which extend in the vertical plane of said stay wires and form between themselves an acute angle which is situated opposite to the angle comprised between the highest and the lowest of said stay wires. 